<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="请输入0-100之间的整数" id="i1">
<input type="button" value="猜一猜" onclick="f()">
<div>
  结果：<span></span>
</div>

<script>
  let x = parseInt(Math.random()*101);
  let count = 0;
  function f() {
    count++;
    let i1 = document.querySelector("#i1");
    let s = document.querySelector("span");
      if (isNaN(i1.value)){
        s.innerText = "输入错误！";
        return;
      }
      if(i1.value>x){
        s.innerText = "猜大了";
      }else if (i1.value<x){
        s.innerText = "猜小了"
      }else{
        s.innerText = "恭喜你猜对了，一共用了"+ count+"次";
        count=0;
        x=parseInt(Math.random()*101);
      }

  }
</script>
</body>
</html>